Improvement in door-alarms



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O. J. ELLIOTT. Door-Alarms.

No. 208,578. Patented Oct. 1, I878..

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2 Sheets-rSheet 2. G. J. ELLIOTT.

Door-Alarms.

No. 208,578. Patented Oct. 1, 1878.

N PETERS, PHOTO LKTHOGRAFHER, WASHINGTON, D c.

l UNITED STATES PATENT OFFICE.

CHARLES J. ELLIOTT, OF POTTSVILLE, PENNSYLVANIA.

IMPROVEMENT IN DOOR-ALARMS.

Specification forming part of Letters Patent No. 208.578, dated October 1. l -T application filed September 10, 197?.

To all whom it may concern: her or elastic washer to prevent the lever F Be it known that I, CHARLES J. ELLIOTT, from working too easily. E is a rivet, either of Pottsville, county of Schuylkill, and State part of the stand or as shown in drawing, Fig. of Pennsylvania, have invented anew and use- 2. E is an extension or arm on the arm E, ful improvement in Door-Alarms, of which and E E are the lugs on the same, which opthe following is a specification: crate the hammer. H is the pin or rivet to The invention relates to that class of alarms confine the hammer and its spring in position.

operated by a knob and spindle, the alarm con- It has a slot in the top for the spring, and is sistin g of a gong and striking apparatus. squared on the bottom to prevent its turning Heretoforesuch alarmshavebeen'constructed in the stand D, to which it is riveted. with spring-catches, ratchet-teeth, or eccen- G is a slot in the hammer for the spring H tries, which as a general thing are objectionato work in. G is a pin or part of the hammer ble, on account of complication of mechanism, which slides on the inclined edges of the lugs inoperativeness, and want of durability. l in the arm E, and falls outside of them, thus produce an alarm simple, efficient under all giving a blow on the gong. circumstances, and durable. 1 construct and operate my alarm as follows: The object of my invention is to provide an I make a stand, 1.), as shown in Fig. 5. The alarm that is easily operated, simple in constem to which the gong is to be attached is struction, and that will set itself without any bored out for the passage of the knob-spindle, aid from the latch-spring in the lock to which and is threaded outside for the gong A to be it may be applied. screwed on. The arm E is made with a square The invention consists in arranging a gonghole in it for the passage of the knob-spindle, bell on a stand and having striking mechanism and has inclined or beveled-edged lugs E E consisting of an arm provided with lugs, which on the lower part of its face, which are to enen gage with a pin on a hammer, and which is gage with the pin on the hammer and raise it brought back to position by a small spiral whenever the arm is moved right or left. There spring, a hammer operated by a flat spring, may be two or more lugs on the arm, as may and a lever to throw the hammer in and out be desired. On the side of the arm opposite of play, the whole arrangement to be placed to the square hole through which the spindle over the lock on a door, and to be operated by passes I place a shorter arm, E having apin the same knobs and spindle that operate the or hook which holds one end of the spiral lock. spring R, the other end of said spring being In the accompanying drawing,in which simisecured to the pin or hook on the stand D. lar letters of reference indicate like parts, Figform the hammer G as shown in Figs. 7 and ure 1 is a front view of my alarm, showing 8, and I secure it to the stand D by the rivet lock, alarm, and door-knob. Fig. 2 is a sec- H, securing the rivet so that the hammer will tional view of the alarm through the line 1 2; move easily. I then take a straight flat steel Fig. 3, a plan view of the striking mechanism; spring, H, and fasten one end of it in a slot, Fig. 4., a reverse view of the same; Fig. 5, a which I cut in the top of the rivet H, and alside view of the stand; Fig. 6, a view of the low the other end of it to rest in a slot, G in rivet or pin which holds the hammer and its the hammer G. The hammer is then held spring; and Figs. 7 and b are side and botstraight by the spring, and will always return tom views of the hammer. Fig.9 shows strikto its original position when released from in g mechanism in connection with gong.

pressure. I place an elastic washer, S, under In detail, A is the gong; B, the door-knob; the lever F, and secure the lever to the stand 0, the knob-spindle which operates the alarm; D by means of the rivet E. D, the stand; E, the arm which operates the By referring to Figs. 3 and 4 of the drawing hammer; F, the lever which throws the hamit will be seen that when the hammer is at rest mer in and out of play; G, the hammer; H, the arm E is in such a posit-ion that by movthe hammer-spring; J and K, small pins or ing it right or left one of the lugs E E will hooks to hold the spiral spring B; S, a ruben gage with the pin on the hammer. This pin will slide up the bev fall oii' outside, the Iner against the go then holding it at eled edge of the lug and spring ll forcing the hamng with a sharp blow, and rest in its ed, \vill contract to its former posiinop- I r is thrown out the lever I to one k again the alarm designed to and knobs J attached.

Having thus I claim as new Patent, is

In a door-alarm, the ing beveled or inclined 7 hammer G, pivoted to the stand D by the rivet H, and having the fiat spring H secured at one end to the rivet H, the other end resting in the slot G, the lever F, with elastic Washer S, and the spiral spring R, secured to the arm Id, and the stand 1), arranged on a door-lock, in connection with the gong A, the knob 11, and knob spindle O, substantially as and for the purpose hereinbefore described and set forth.

CHARLES J. ELLIOTT.

, and desire to secure by Letters swinging arm E, havedged lugs E E, the

\Vitnesses:

cCooL, IS.

described my invention, what 

